I have a 2017 Nismo FWD 6 spd. I also had a 2013 Juke FWD SV, and manuals back to my '70 Valiant. 3 on the tree. If I recall, that manual didn't recommend down shifting. I did it then and do it now. If I couldn't I wouldn't have gone crazy trying to find a manual. Am I doing any harm? If so, why?